[Brock Tech]

Are they still available

 

[sherlock9c1]

@Brock Tech yes, as of right now. if this ad is up, they're available. Send me a direct message ("start a conversation.")

 

[dwardo]

Sherlock, I thought I sent you my address in one of my replies but things are getting stuck so I'll just resend it here.

[edited out for privacy]

Thanks

 

[sherlock9c1]

@dwardo got it. I edited it out for your privacy.

 

[dwardo]

Thanks!

 

[sherlock9c1]

Just an update, I still have a few sets of these 36lb injectors on hand. @Blue Wail also mentioned that Racetronix is now selling a 24lb drop-in replacement that looks like a very good piece. If you don't need more flow rate than stock, these are a great option. I don't have any personal experience with them so I can't vouch for how closely they follow the original voltage offsets, short pulse adders or fuel puddling/boiling values, but if he likes them, that's good enough for me.

 

[sherlock9c1]

From this injector rehab company, their take on the stock LT1 injectors:

Coil windings short out internally resulting in a drop (or rise) in resistance. These can sometimes be tricky to detect at home. When the injector is not being pulsed, the injector could ohm out to spec, but once they are energized the problem shows its effects and the resistance will rise or fall. Once this problem occurs, there is nothing that can be done other than to replace the injector. Known for continual leaking. Will be corrected and start leaking again shortly after.
We go so fed up with dealing with these injectors that we dumped 10’s of thousands of cores into our dumpster and vowed to never sell another reman’d core as long as we are in business. One of the biggest pieces of $@#t injectors ever made.
These were commonly found on many GM models from the late 80’s to early 90’s having a grey or black top.

 

[cappy p]

I have a set of Sherlock’s 36 lb/hr injectors on my wagon.
The injector data provided is 100% accurate; they are a true “plug and play” solution.

 

[Sinister]

I will be contacting you about a set of these in the near future.

 

[blueallie]

Sent PM

 

[sherlock9c1]

Quick update - I edited Post #1 to lay out specific HP capabilities at given fuel pressure, BSFC and duty cycle.

Also, I have secured a source of 50lb injectors (at a slightly higher price point) and am hoping to start development/testing in early May 2023. More to come.

 

[sherlock9c1]

One other update - The Standard Motor Products PR556 adjustable regulator has a set screw that allows you to adjust fuel pressure. I am experimenting with it as I write this; it is very affordable, but I do not know its min/max limits (I'll post it soon). The Aeromotive 13107 is explicitly labeled as adjustable from 30-70psi which allows you to easily run LS pressure (58psi) but it is significantly more expensive.

Do also be aware that fuel pump output reduces as fuel pressure increases, so choosing fuel pressure can become a balance point between the pump and the injector duty cycle. I can calculate the injector characterization data for whatever pressure you design the system to run at.

 

[blueallie]

Thanks Joel! Injectors are working beautifully. Car has a smoother idle and just feels all around better. Hopefully the car will get a little better mpg. Still have to put some more miles on her.
Old injectors were definitely showing their age.

 

[SoCalChlln]

As you probably know, the stock injectors are prone to failure from ethanol exposure. But so are many of the common LT1 swap injectors. And try finding the correct short pulse adders and voltage offsets to make these work properly at low pulsewidths. Furthermore, at the GM design limit of 80% duty cycle, the stock injectors at stock pressure only support 290hp on E10, or 325hp if you're willing to push them to 90%. Or if you buy an adjustable fuel pressure regulator and up it to 58psi, you can support 335hp at 80%, or 385hp at 90% duty cycle. But you'll still have failures due to ethanol.

Other articles discussing the problems with our stock injectors are:

1. Mr. Injector's comments on Rochester Multec injectors
2. GM TSB on injector cleaning susceptibility to solvents

I have a few sets of much newer (2016 Model Year) injectors available:

• NEW for 2022 - LS PCM data available for Torqhead/ EFI Connection / 24x / HP tuners.
• NEW for May 2021 - I'm including the four fuel rail o-rings with all injector shipments so you can have peace of mind with ALL new o-rings protecting your ride from fire hazards! (109, 110x2, 112)
• 30 years newer design.
• Ethanol proof, E85 friendly.
• Vastly improved spray pattern.
• Better starting, idling and part throttle drivability.
• Up to 10% better fuel consumption than your stockers.
• 36lb/hr flow rate at 43.5psi (stock is 24), or 41.6 at LS pressure (58 psi).
• How much HP can they support? At 43.5psi and a BSFC of 0.55:
  • 415hp at 80% duty cycle, (GM policy specifies no more than 80% duty cycle to avoid overheating the coil windings)
  • 430hp at 83% duty cycle,
  • 467hp at 90% duty cycle.
• If you use a different regulator and pump to go to LS fuel pressure (58 psi):
  • 485hp at 80% duty cycle
  • 505hp at 83% duty cycle
  • 545hp at 90% duty cycle

View attachment 210875

• Side note: GM limits max duty cycle to 80% to prevent injector overheating. Practically speaking, you can run beyond that for very short periods of time, but if our OEM follows that limit, you should consider it as well.
• Permanently gets rid of annoying intermittent misfires at idle due to stock injectors gradually failing, and they WILL fail eventually.
• Comes with FULL characterization data specifically for LT1 PCMs (voltage offsets and short pulse adders; most tuners just change flow rate and drivability suffers).
• Requires reprogramming your PCM. If you email me your tune file, I can update the injector data. You can do upload/download easily for the '94-95s yourself with a programming cable and flashHack, or I can do a PCM exchange. For 96s, you can upload/download via TunerCat OBD2 or JET DST….

$250 shipped in continental United States of America.
To get my Paypal info, hover over my username and click "message" or click on my username and then click "start conversation." My feedback is here.

Do you still offer these injectors along with information on how to update my pcm via Jet DST ?

 

[sherlock9c1]

Do you still offer these injectors along with information on how to update my pcm via Jet DST ?

Yes, I just don’t advertise a bunch. I’ve got several sets tested and ready. Send me a direct message and we can get you fueling properly.

 

[smartieab]

Yes, I just don’t advertise a bunch. I’ve got several sets tested and ready. Send me a direct message and we can get you fueling properly.

Just looking and thinking about down the road. Thinking about addressing issues on my L99 before they become an issue, since her history is largely unknown to me. Would they work on the L99, or would they be too big? I was thinking about replacing injectors and of course gaskets in the future. One of many thoughts in my head. I want to do it all at once, but I have to budget my plans.

 

[sherlock9c1]

@smartieab yes they’ll work on L99s. Whenever you’re ready, just send me a direct message.

 

[smartieab]

As you probably know, the stock injectors are prone to failure from ethanol exposure. But so are many of the common LT1 swap injectors. And try finding the correct short pulse adders and voltage offsets to make these work properly at low pulsewidths. Furthermore, at the GM design limit of 80% duty cycle, the stock injectors at stock pressure only support 290hp on E10, or 325hp if you're willing to push them to 90%. Or if you buy an adjustable fuel pressure regulator and up it to 58psi, you can support 335hp at 80%, or 385hp at 90% duty cycle. But you'll still have failures due to ethanol.

Other articles discussing the problems with our stock injectors are:

1. Mr. Injector's comments on Rochester Multec injectors
2. GM TSB on injector cleaning susceptibility to solvents

I have a few sets of much newer (2016 Model Year) injectors available:

• NEW for 2022 - LS PCM data available for Torqhead/ EFI Connection / 24x / HP tuners.
• NEW for May 2021 - I'm including the four fuel rail o-rings with all injector shipments so you can have peace of mind with ALL new o-rings protecting your ride from fire hazards! (109, 110x2, 112)
• 30 years newer design.
• Ethanol proof, E85 friendly.
• Vastly improved spray pattern.
• Better starting, idling and part throttle drivability.
• Up to 10% better fuel consumption than your stockers.
• 36lb/hr flow rate at 43.5psi (stock is 24), or 41.6 at LS pressure (58 psi).
• How much HP can they support? At 43.5psi and a BSFC of 0.55:
  • 415hp at 80% duty cycle, (GM policy specifies no more than 80% duty cycle to avoid overheating the coil windings)
  • 430hp at 83% duty cycle,
  • 467hp at 90% duty cycle.
• If you use a different regulator and pump to go to LS fuel pressure (58 psi):
  • 485hp at 80% duty cycle
  • 505hp at 83% duty cycle
  • 545hp at 90% duty cycle

View attachment 210875

• Side note: GM limits max duty cycle to 80% to prevent injector overheating. Practically speaking, you can run beyond that for very short periods of time, but if our OEM follows that limit, you should consider it as well.
• Permanently gets rid of annoying intermittent misfires at idle due to stock injectors gradually failing, and they WILL fail eventually.
• Comes with FULL characterization data specifically for LT1 PCMs (voltage offsets and short pulse adders; most tuners just change flow rate and drivability suffers).
• Requires reprogramming your PCM. If you email me your tune file, I can update the injector data. You can do upload/download easily for the '94-95s yourself with a programming cable and flashHack, or I can do a PCM exchange. For 96s, you can upload/download via TunerCat OBD2 or JET DST but I cannot do '96 PCM exchanges at this time.
• Injectors come equipped ready to drop in with all necessary adapters. Wiring harness adapters will likely not clear GM corvette fuel rail covers.
• Only $250 shipped - cheaper than new injectors that don't have characterization data, same price as trying to have your stockers refurbished. Trust me I'm not getting rich off of this. I refused to spend $1000 for Injector Dynamics' injectors so I spent a lot of time digging for an alternative solution. You get to benefit from the hard work.

$250 shipped in continental United States of America.
To get my Paypal info, hover over my username and click "message" or click on my username and then click "start conversation." My feedback is here.

Sherlock, What The Fluff did you do to me? WTH, I will look at EEHack. I will dip my toe in the pool. I feel like I dipped my toe into the Arctic Ocean in the middle of winter. EEHank, EEX, TunerPro, Bin files. I feel like an old LP that keeps skipping. I think you gave me a headache.

I am going to have to start from scratch later tonight when it’s quiet. I haven’t had to read or study like this in years. It will probably help once I can download a “dummy” file to play with.

 

[Marky Dissod]

It will probably help once I can download a “dummy” file to play with.

Factory LT1 Bins – ecmhack

ecmhack.com

All the dummy files you could ever want.

 

[PeterDuerr]

It can be overwhelming figuering it all out. You load the "definition file" into tuner pro to decode your cars program.

Eehack is for diagmostics and datalogs.

But all that said, there is only so much a guy can do. Its good hire someone to do the majority of the heavy lifting.

There are many out there, @Marky Dissod has been great for me.